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ne esta HENRY Nick, or Panis, FRANCE.

Letters Patent No. 113,918, dated April 18, 1871; antedated April 8, 187,1.

lMPROJEMENT IN SHEAVE OR PULLEY-BLOCKS.

The Schedule referred to in these Letters Patent and making pari; of the same.

To whom tt may concern Paris, France, have invented an Improved Sheave or Pulley for Ships Blocks or other`- purposes, for which Letters Patent have been granted to me in the Empire of France fora term of fifteen years from the date of 7th December, 186,7; and that I do hereby declare that the following is a full, clear, and exact description of, the same, reference Abeing made to the annexed drawing making a part f this speciiication.

My invention relates to the sheaves or wheels of pulley or ships7 blocks, and consists in "constructing them of wood and metal in a novel manner, as hereinafter explained.

Ihe sheaves or pulley-wheels heretofore used in ships blocks have generally beenmade of bignamfu'tfe, and turned out of a single piece. They have sometimes been made oi' cast-iron, bronze, or porcelain, but these have been very little used.

The many disadvantages presented by these sheaves and the expense of the material they required determined me to seek for and make a new -kind of sheave out of wood and metal combined. I will state in a few words some of the principal disadvantages of the present sheaves, and then clearly show how my new sheave of Wood and metal uavoids them necessarily by its construction, arrangement, and the manner of its improvement.

In the first place, the present method of making these sheaves is very expensive, for the reason that it is necessary to use a particular kind of very hardwood.

In the next place, although the wood` may be of a close texture and very tough, yet the sheave is so constantly used. at its center that the opening becomes oval and consequently the shave unserviceable.

And finally, the groove which is made around the sheave being very shallow, a pretty notable wear and tear of the cord and cables follow.

It is also necessary to take account of the unavoidable heating of the Wood in its rotary movement.

My new sheave, which I cali a Wood-and-metal sheave, (lignomctall'iqne,) avoids the above-mentioned disadvantages. Its easy 4construction and 4excellent operation are certain guarantees of the advantages that are secured by its use.

- Instead of taking legitiem-vitae for making the disk of the-pulley, I use beech or any other ordinary wood of a similar kind, and cover its periphery with a band or strip of copper, iron, or other metal.

v In this way I am able to give the sheave or pulleywheel a deep groove,`which will prevent the slipping of Athe cord.

In order to prevent the wear which occurs at the center, or at least to readily and economically substitute a nave, I make in the dish of beech forming a part of the sheave an oval aperture, into which I forcibly insert a tube of copper or other metal having an oval interior and periphery.V

In this tube I adjust a movable cushion, oval on its exterior and cylindrical in its interior. rIhis movable cushion can be replaced byanother and similar one whenever it shall have become so worn as to require it.

The other parts maybe removed and others substituted in like manner.

'Io each side of the disk, about the center, I attach a metallic shield, which serves to prevent any contact and consequent wear between the disk and its case or block.

The construction and arrangement of this composite sheave will be better understood by reference to the drawing.

Figure l is a side view;

Figure 2 is a cross-section;

Figure 3 is a side view ot' the wooden disk;

Figure 4, is a cross-section of the same; and

Figures 5, 6, and 7 are views of parts detached.`

' A disk, a, of any size and thickness desired, is made of beech or other similar wood, and au oval hole or aperture, b, is made through its center, as shown in fig. 3, and a groove, g, is turned in its periphery, as shown in iig. 4.

Within the hole b is inserted a false nave, c', made of copper or-other suitable metal, as shown in iigs. l and 2. It is in the form of an oval tube externally and internally, and is secured in any suitable manner, and is shown in detail in ngi 5.

Into this oval tube or false nave c is driven a cushion, d, of metal, as shown in Iigs. 1 and 2. The exterior of this cushion is of the same size and form as the interior of the tube c, so as to tit it close and tight, while its interior is cylindrical.

In fig. 7 is shown an end view and a section of this cushion d. Its cylindrical opening is for the purpose of mounting it on the axis of the block.

'Io each side of the disk and about the tube c is attached, by means of screws`or other suitable devices,

a shield, j', as shown in igsfl and 2. These shields f vare so made and arranged that when in position on the disk their outer faeeivill extend far enough beyond the sides of the disk to prevent its comingr in contact with its case. In g. 6 is shown a side view and section of this shield.

The groove g of the disk is lined with sheet-copper, h, or other suitable material, as clearly shown in iig. 2. This lining is made to it the groove closely, and its edges are turned over the edges of the groove and formed down smoothly on the sides of the disk, as clearly shown in the same figure.

It is obvious that the false nave or tube c may be made in other forms, and may have projections on its side to secure it in place, and may, iu fact, be secured in a variety of ways; that the sides of the disks may have swelling faces for diminishing the friction, and that any suitable metal or Wood may be used.

Having thus desori` ed my invention,

What I claim isl. A sheave, consisting of a Wooden disk, a, having a false nave or tube', 0,. in its center, with aremovable cushion or bearing, d, therein, also having its groove protected by a metal lining and itssides with metal shields substantially as herein described. v 2. A wooden sheave having its groove lined with sheet metal, substantially :as herein described and for f the purposeset forth.

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3. In combination with a 'wooden sheave the convex metallic shields f, arranged substantially as herein described and for the purpose set forth.

4. In combination with a wooden sheave, the removable cushion or bearingd, when constructed and arranged snbstantially as and for the purpose set forth.

5. The combination of thek false nave c and removable enshion d, when constructed and arranged substantially as and for the purpose set forth.

HENRY NICK. [L.s.]

AWitnesses:

v J. U. ZUsT, T. BAssET. 

